Method for preparing ultrapure iron concentrate powder from common grade iron mine

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a method for preparing ultrapure iron concentrate powder from a common grade iron mine. The method comprises the following steps: grinding and enriching the iron mine to obtain common grade iron miner powder in which TFe accounts for 58%-65%, then adding sodium hydroxide solution, mixing, performing desilicication reaction, washing with water, filtering, and drying to obtain ultrapure iron concentrate powder in which TFe accounts for 69.0%-71.5%. According to the method, low-cost available industrial sodium hydroxide replaces poor coking coal resources, so that the reduction cost of iron mine can be lowered, melting energy consumption can be reduced, carbon emission is reduced, and the energy-saving and environment-friendly purposes can be reduced; and the sodium hydroxide solution reacts with SiO2, silicon content in the iron mine is greatly reduced and the iron grade is improved.

Description

Technical field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing ultra-pure iron concentrate powder by using ordinary grade iron ore. Background technique

[0002] China is the world's largest steel country, and its annual output in 2014 has exceeded 800 million tons. Although my country's iron ore resources are widely distributed and have large reserves, the distribution of low-poor, fine, and refractory iron ore resources accounts for more than 96%. Therefore, China needs to import 55% of rich iron ore abroad every year. Due to technical reasons, my country's abundant low-poor, fine-to-fine and hard-to-dress iron ore resources have never been well developed and utilized, resulting in idle and wasted resources, and rich ore resources are becoming less and less and tending to be exhausted.

[0003] The grade of iron ore powder purchased by steel plants is also getting lower and lower. Now the grade of iron ore p...

Examples

Embodiment 1

[0017] A method for preparing ultra-pure iron concentrate powder from ordinary grade iron ore, the steps are as follows:

[0018] (1) Using Sichuan Jiangyou oolitic hematite, the iron ore is processed and polished to -200 mesh, and concentrated by strong magnetic separation to obtain TFe: 59.56% iron ore powder;

[0019] (2) After mixing the iron ore powder of step (1) with 40wt% sodium hydroxide solution, add it to the reaction kettle; wherein the volume ratio of iron ore powder to sodium hydroxide solution is 1:4;

[0020] (3) Control the heating temperature of the materials in the reactor to be 170~180℃, the stirring speed is 116r / min, the pressure is 0.48MPa, and the heating reaction time is 2.5h;

[0021] (4) After the reaction of the materials in the reactor is completed, vacuum filtration is used to separate the tail water from the solids, and the obtained tail water is water glass;

[0022] (5) Add 1 times clear water to the solid of step (4) for washing and vacuum filtration, a...

Embodiment 2

[0025] A method for preparing ultra-pure iron concentrate powder from ordinary grade iron ore, the steps are as follows:

[0026] (1) Using Liaoxi Beiping iron ore, processed and polished to -200 mesh accounting for more than 90%, and enriched by magnetic separation to obtain TFe: 66.86% iron ore powder;

[0027] (2) After mixing the iron ore powder of step (1) with 20wt% sodium hydroxide solution, add it to the reaction kettle; wherein the volume ratio of iron ore powder to sodium hydroxide solution is 1:4;

[0028] (3) Control the heating temperature of the materials in the reactor to be 170-180°C, the stirring speed is 90r / min, the pressure is 0.45MPa, and the heating reaction time is 2.5h;

[0029] (4) After the reaction of the materials in the reactor is completed, vacuum filtration is used to separate the tail water from the solids, and the obtained tail water is water glass;

[0030] (5) Add 1 times clear water to the solid of step (4) for washing and vacuum filtration, and the f...

Embodiment 3

[0033] A method for preparing ultra-pure iron concentrate powder from ordinary grade iron ore, the steps are as follows:

[0034] (1) Using Jilin Baishan iron ore, processed and polished to -200 mesh accounting for more than 80%, and enriched by magnetic separation to obtain TFe: 65.24% iron ore powder;

[0035] (2) After mixing the iron ore powder of step (1) with 40wt% sodium hydroxide solution, add it to the reaction kettle; wherein the volume ratio of iron ore powder to sodium hydroxide solution is 1:4;

[0036] (3) Control the heating temperature of the materials in the reactor to be 160~170℃, the stirring speed is 80r / min, the pressure is 0.4MPa, and the heating reaction time is 2.0h;

[0037] (4) After the reaction of the materials in the reactor is completed, vacuum filtration is used to separate the tail water from the solids, and the obtained tail water is water glass;

[0038] (5) Add 1 times clear water to the solid of step (4) for washing and vacuum filtration, and the filt...

Technical field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing ultra-pure iron concentrate powder by using ordinary grade iron ore. Background technique

[0002] China is the world's largest steel country, and its annual output in 2014 has exceeded 800 million tons. Although my country's iron ore resources are widely distributed and have large reserves, the distribution of low-poor, fine, and refractory iron ore resources accounts for more than 96%. Therefore, China needs to import 55% of rich iron ore abroad every year. Due to technical reasons, my country's abundant low-poor, fine-to-fine and hard-to-dress iron ore resources have never been well developed and utilized, resulting in idle and wasted resources, and rich ore resources are becoming less and less and tending to be exhausted.

[0003] The grade of iron ore powder purchased by steel plants is also getting lower and lower. Now the grade of iron ore p...

Examples

Embodiment 1

[0017] A method for preparing ultra-pure iron concentrate powder from ordinary grade iron ore, the steps are as follows:

[0018] (1) Using Sichuan Jiangyou oolitic hematite, the iron ore is processed and polished to -200 mesh, and concentrated by strong magnetic separation to obtain TFe: 59.56% iron ore powder;

[0019] (2) After mixing the iron ore powder of step (1) with 40wt% sodium hydroxide solution, add it to the reaction kettle; wherein the volume ratio of iron ore powder to sodium hydroxide solution is 1:4;

[0020] (3) Control the heating temperature of the materials in the reactor to be 170~180℃, the stirring speed is 116r / min, the pressure is 0.48MPa, and the heating reaction time is 2.5h;

[0021] (4) After the reaction of the materials in the reactor is completed, vacuum filtration is used to separate the tail water from the solids, and the obtained tail water is water glass;

[0022] (5) Add 1 times clear water to the solid of step (4) for washing and vacuum filtration, a...

Embodiment 2

[0025] A method for preparing ultra-pure iron concentrate powder from ordinary grade iron ore, the steps are as follows:

[0026] (1) Using Liaoxi Beiping iron ore, processed and polished to -200 mesh accounting for more than 90%, and enriched by magnetic separation to obtain TFe: 66.86% iron ore powder;

[0027] (2) After mixing the iron ore powder of step (1) with 20wt% sodium hydroxide solution, add it to the reaction kettle; wherein the volume ratio of iron ore powder to sodium hydroxide solution is 1:4;

[0028] (3) Control the heating temperature of the materials in the reactor to be 170-180°C, the stirring speed is 90r / min, the pressure is 0.45MPa, and the heating reaction time is 2.5h;

[0029] (4) After the reaction of the materials in the reactor is completed, vacuum filtration is used to separate the tail water from the solids, and the obtained tail water is water glass;

[0030] (5) Add 1 times clear water to the solid of step (4) for washing and vacuum filtration, and the f...

Embodiment 3

[0033] A method for preparing ultra-pure iron concentrate powder from ordinary grade iron ore, the steps are as follows:

[0034] (1) Using Jilin Baishan iron ore, processed and polished to -200 mesh accounting for more than 80%, and enriched by magnetic separation to obtain TFe: 65.24% iron ore powder;

[0035] (2) After mixing the iron ore powder of step (1) with 40wt% sodium hydroxide solution, add it to the reaction kettle; wherein the volume ratio of iron ore powder to sodium hydroxide solution is 1:4;

[0036] (3) Control the heating temperature of the materials in the reactor to be 160~170℃, the stirring speed is 80r / min, the pressure is 0.4MPa, and the heating reaction time is 2.0h;

[0037] (4) After the reaction of the materials in the reactor is completed, vacuum filtration is used to separate the tail water from the solids, and the obtained tail water is water glass;

[0038] (5) Add 1 times clear water to the solid of step (4) for washing and vacuum filtration, and the filt...